Abstract: Provided is a system for testing mobile handover which makes it possible to test a handover operation on a mobile side by providing an actual base station with a radio wave environment for causing mobile devices to move. The system is intended to test whether or not a handover operation of a mobile present in the service areas of at least three base stations is performed without interrupting service while the mobile moves from the service area of a currently connected base station to another spot.

Abstract: A method of adjusting the coverage of a small cell for efficient use of cell resources in which the position of user equipment (UE) in the small cell is estimated using timing advance information of the UE, and the coverage is adjusted in consideration of a load state of the cell and a channel state of the UE.

Abstract: A method of offloading wireless data in a core network using a femtocell which can reduce a traffic load of a mobile communication network and maximize convenience of a user by determining to offload the wireless data passing through the core network onto a local network according to whether the data is real-time data is provided.

Abstract: An apparatus for generating indexes of an interleaver for input data comprises: a main processor for calculating an index for a predetermined bit of the input data; and an index operator for receiving the index calculated by the main processor, calculating in parallel indexes for bits after the predetermined bit, and deriving a plurality of indexes. The main processor calculates the index for ith to (i+15)th bits of the input data where i is an integer equal to or larger than 0, and transfers a result of (128*f2)modK to the index operator. The index operator calculates an index for an (i+j+16)th bit where j is an integer which satisfies 0?j?7 by using an equation of ?(i+j+16)=(2*?(i+j+8)??(i+j)+128*f2)modK where K is a size of the input data and f2 is a coefficient calculated from K.

Abstract: A method of measuring a call delay time by synchronizing times of a replaying part and a recording part in a call delay time measuring device using an interrupting hardware method. The method includes reading an original WAV file when a replaying CPU receives a command, waiting for writing to a DAC buffer of a replaying CODEC, transferring a signal of recording-ready to a recording CPU, generating a recording WAV file by the recording CPU, waiting for reading from an ADC buffer of a recording CODEC, transferring a signal of complete recording-ready to the replaying CPU, recording the original WAV file, replaying the original WAV file and simultaneously transferring a signal of recording-start to the recording CPU, and reading audio data from the ADC buffer of the recording part by the recording CPU and recording the audio data to the recording WAV file.

Abstract: A flexible connection control femtocell access point device of a small cell and a method of driving the same are provided. A maximum system load is used and network efficiency is maximized by calculating a system load occurring when a mobile station is newly connected according to the type of services that user equipments, that is, mobile stations, in a small cell, such as a femtocell, desire to use, comparing the calculated system load and the maximum system load, and determining whether to limit connection of the mobile station.

Abstract: An adaptive interference cancellation apparatus for cancelling a side lobe between neighboring cells installed in a repeater and capable of improving quality of a communication signal and preventing frequent handover by maintaining a serving base station signal among repeater signals and cancelling an interference signal from a neighboring cell is provided.

Abstract: A device for transmitting TDD downlink data in an LTE system includes: a data buffer sequentially loading IP data irregularly delivered from a layer 3 processing unit; a transmission control unit providing instructions for the creation of an ordinary downlink sub-frame PDU queue and a special sub-frame PDU queue at a ratio appropriate to UL/DL configuration information and sequentially delivering the data loaded in the ordinary downlink sub-frame PDU queue and the special sub-frame PDU queue to a layer 1 processing unit in the order prescribed in UL/DL configuration and in the loaded order; and an ordinary downlink sub-frame PDU queue creating unit and a special sub-frame PDU queue creating unit which create the ordinary downlink sub-frame PDU queue and the special sub-frame PDU queue according to the instructions of the transmission control unit and load the data loaded in the data buffer.

Abstract: Provided is a method for controlling a time division duplexing (TDD) Tx/Rx switching timing in a cloud radio access network (CRAN) that can finely control a switching timing between transmission and reception of TDD signals with an additional component added to a digital unit (DU) and a radio unit (RU) in the CRAN.

Abstract: A device for maintaining synchronization of a plurality of FPGAs which can easily and precisely maintain the synchronization of the plurality of FPGAs in a device in which two or more FPGAs are interactively connected and operated is provided. The device is included in each of the plurality of FPGAs, and includes a trigger signal generator configured to generate an internal trigger signal itself; a trigger multiplexer configured to select one of the internal trigger signal generated by the trigger signal generator and a trigger signal input from the outside; a delay signal generator including a plurality of stages of flip-flops, each of the plurality of stages of flip-flops configured to delay the trigger signal by one clock cycle; and a synchronization multiplexer configured to select and output one of output signals of the plurality of stages of flip-flops of the delay signal generator.

Abstract: Long Term Evolution (LTE) cell detecting apparatus includes a secondary synchronization signal (SSS) reference signal generating unit for generating reference signals of all SSSs included in a specific subframe, a memory for storing a reference phase difference sequence with respect to the reference signal of the SSS generated, a Fast Fourier Transform (FFT) operation unit for performing an FFT operation with respect to a received radio signal to output a primary synchronization signal (PSS) and an SSS, a time synchronization acquisition unit for acquiring LTE time synchronization by the PSS output from the FFT operation unit, and a cell detection unit for detecting an LTE cell by the time synchronization information acquired by the time synchronization acquisition unit and a correlation between a phase difference sequence of a received SSS output from the FFT operation unit and the reference phase difference sequence stored in the memory.

Abstract: An apparatus and method for compensating for a timing offset in a spread spectrum system which perform an oversampling of respective symbols to obtain a plurality of samples, estimate a chip clock timing offset and a symbol clock timing offset from the plurality of samples, and compensate for the chip clock timing offset and the symbol clock timing offset.

Abstract: A flexible connection control femtocell access point device of a small cell and a method of driving the same are provided. A maximum system load is used and network efficiency is maximized by calculating a system load occurring when a mobile station is newly connected according to the type of services that user equipments, that is, mobile stations, in a small cell, such as a femtocell, desire to use, comparing the calculated system load and the maximum system load, and determining whether to limit connection of the mobile station.

Abstract: Disclosed herein is a method of detecting a physical downlink control channel (PDCCH) in a long-term evolution (LTE) system. In this method, one is selected from among possible PDCCH formats for received base station signals, and a signal corresponding to the length of the selected PDCCH format is retrieved. Thereafter, one is selected from among one or more of possible DCI formats that have not been selected yet. Thereafter, decoding is performed using the retrieved signal and the selected DCI format. Finally, a remainder is obtained by dividing the decoded signal by a cyclic redundancy check (CRC) pattern, and the remainder is stored as RNTI information, along with the selected DCI and the DCI format.

Abstract: Provided is a method for compressing and decompressing I/Q sample data in a cloud radio access network (CRAN) that uses a fixed compression ratio and also determines a bit to be removed according a magnitude of an absolute value of the I/Q sample data when the I/Q sample data transmitted and received between a digital unit (DU) and an radio unit (RU) in the CRAN is compressed and decompressed. A method for compressing I/Q sample data in the CRAN includes: calculating absolute values of all sample data in each unit block, the unit block being a basic unit of compression; determining an SMAX, the SMAX being sample data having a maximum of the absolute values; extracting sample data by a predetermined number of bits; coding information about the number of bits removed from high-order or low-order bits; and adding a sign bit before or after coding the information.

Abstract: An apparatus and a method of compensating for an I/Q imbalance in a direct up-conversion system prevents the performance of the system from being deteriorated by efficiently compensating for an I/Q timing skew, an I/Q phase imbalance, and an I/Q gain imbalance by using a characteristic of an OFDM scheme in an Orthogonal Frequency Domain Multiple (Access) (OFDM(A)) system using a direct up-conversion scheme. According to the apparatus and the method of compensating for an I/Q imbalance in the direct up-conversion system of the present invention, an OFDM(A) system using a direct up-conversion scheme may efficiently compensate for I/Q timing skew, I/Q phase imbalance, and I/Q gain imbalance by using a characteristic of an OFDMA scheme, so that a performance of the system is prevented from being deteriorated.

Abstract: A turbo encoder apparatus includes: a first element encoder for receiving an input of a bitstream of the data, encoding the input of the bitstream of the data, and generating a first output bitstream in an unit of plural bits; an internal interleaver for generating an interleaved input bitstream from the bitstream of the data; a second element encoder for receiving an input of the interleaved input bitstream in the unit of plural bits, encoding the input of the interleaved input bitstream, and generating a second output bitstream in an unit of plural bits; a trellis-termination-encoder for generating bits for trellis terminations of the first element encoder and the second element encoder; and a bitstream assembler for receiving the first output bitstream, the second output bitstream, and the bits for the trellis terminations and generating an input bitstream for a rate matching.

Abstract: The present invention relates, in general, to a method of decoding a Physical Broadcast Channel (PBCH) in a Long Term Evolution (LTE) system and, more particularly, to a method of detecting a Master Information Block (MIB) contained in a PBCH.

Abstract: The present invention relates to an apparatus and a method for eliminating I/Q offset in a receiver of a SC-FDMA system which improves performance of the system by accurate measurement and cancellation of I/Q offset in a receiver of a SC-FDMA system operating in a 3GPP LTE uplink.

Abstract: This invention relates to an automatic detection apparatus for UL/DL configuration in LTE-TDD signal and the method thereby for automatically detecting the UL/DL configuration number of an LTE-TDD signal without a decoder by using a simple structure.